Which URI mapping should you add?
Which XAML fragment should you insert at lines 03 and 04?
Which XAML fragment should you use?
Which value of ZIndex should you set to each ellipse?
Which code segment should you write in the load event of the window?
Which code segment should you insert at line 06?
Which code segment should you insert at line 03?
Which code segment should you insert at line 11?